SOLPERK 10W Solar Panel，12V Solar Panel Charger Kit+8A Controller，Suitable for Automotive, Motorcycle, Boat, ATV, Marine, RV, Trailer, Powersports, Snowmobile etc. Various 12V Batteries. (10W Solar)

I purchased 2 of these, one for my generator and one for my boat. I have a different controller where I can monitor the actual voltage, but connect it to this panel for both uses. The panels are about a year old. They are mounted outside in the weather and have worked well. For my generator: it has kept my gel battery topped off and have strong starts every time. For the boat: It has supplied enough power to keep my 890CCA battery maintained during the winter and when the boat is not in use during the season, I have kept it plugged in and maintains a full charge. Given my boat battery is fairly big, this panel has worked fine. When I place my battery tester on it the tester confirms a 98% charge after winter. Pretty impressive considering the size of the battery and only 10W out from the panel. The panels get direct daylight for about 5 hours a day and then are in shadow. The controllers show charging still in the shadow so direct sunlight is not exactly needed but if you want to maximize your capabilities, I'd say make sure they have enough direct light for at least 1/2 of the day. Otherwise, the shade doesn't appear to hurt it any. Cloudy days still produce a good charge. Going to purchase another soon for my father's new generator that I am going to buy for him.

I bought this in dec 2020 and its still working great. it maintains 2 utillity Batterys on a standby generator that also supply power to a security camera and my outdoor bbq pergola with led lights

This is a very well made solar charger. The only problem I had was that the polarity is backward from the other one I have. My bad for having assumed that the same connector would have the same polarity, but I guess IEEE standards don't trickle down to this level of engineering. No matter, once I reversed the polarity of the solar panel wires connected directly to the battery on my RV everything worked like a dream. It's a good value and should add years of life to my RV battery. I would recommend this unit if you're looking for a weatherproof outdoor-rated solar-powered 12v battery trickle charger.

I discovered my new solar panel from a different supplier had failed after one winter storage season connected to RV house batteries. The battery pack is two 6 volt deep cycle batteries and they were down to 11.2 volts when i checked them late this spring. I removed the batteries, added water as required, and properly charged of them at home. I then connected the solar panel to the battery pack set up for 12 volts service to see if it could maintain them overtime. The panel drives the battery pack up to 13.5 volts on full sun days even with it not located in an optimum location. In our current heavy overcast conditions, due to the smoke from the west coast fires, the panel still is pushing the pack up to 12.8 volts. Time will tell if this solar panel system can do the job for the RV storage season but I am currently satisfied with the items performance. The battery pack will remain at home for this winter so I will monitor their condition through out the winter and update if necessary.

Ok, first things first. This, or any other 10W panel, WILL NOT recharge your big dead battery. For that choose something bigger, like at least 30W. What it does do is keep your battery from discharging over time in a vehicle you don't use often. Just like the description and instructions say! It's super simple to hook up but if you have a question like I did, tech support replies within hours. Great little unit. Would definitely buy a sefond one of I had another vehicle that's parked a lot.